Tag Feed Plugin How To

I installed Tag Feed and the Post Indexer (yes, the tables were created).
I thought this plugin could work with categories but it doesn't. I had to create a tag. Is there a way to get it to work with categories?

Also, how can you tie it in with an rss feed? Can you show me an example of how this plugin is used?

Hi Andrew,
I have a category called 'News' and when I plug that in I don't get anything. I created a tag called 'current' and got this: http://cornhill.org/cornhillbeta/wp-content/tag-feed.php?tag=current.
I didn't want to create tags, just categories.
How would you use this with a subscription so people can subscribe to the 'News' category?
Thanks.

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